Excavating-machine.



C. B. KING, C. S. JOHNSON & B. JACOBY.

EXCAVATING MACHINE.

APPLICATION FILED SEPT. 25. 1915.

` Patented Sept. 5, 12H6.

7 SHEETS-SHEET l.

C. B. KING, C. S. )OHNSON 6L B. JACOBY.

EXCAVATING MACHINE.

APPLlcATloN man SEPT. 25, 1915.

Patented Sept 5, 1916.

Lwlm

@www

C. B. KING, C. S. )OHNSON & B. JACOBY.

EXCAVATING MACHINE.

vAPPLICATION FILED SEPT.25,|915.

7 SHEETS-SHEET 3.

PaendSfpt. 5, 1916.

ISH-EETSSHEET 4,

EXCAVATING MACHINE.

`APPLICATION FILED SEPT. 25. Isls.

IIII

C. B. KING, C. S. JOHNSON & B. JACOBY.

y x x x x f( I lI C. B. KING, C. S. JOHNSON 6L B. JACOBY.

EXCAVATING MACHINE. APPLICATION FILED SPT. 25, l9l5..

l a l 9,95?, A Patentvd Sept. 5, 19H5.

TSHEETS-SHEET 5.

C. B. KING, C. IOHNSON L B. IACOBY. EXCAVATING MACHINE.

APPLICATION FILED SEPT. 2v5. 1915.

Patented Sept. 5, 1916.

7 SHEETS-SHEET 6.

C. B. KNG, C. S. JOHNSON 6L B. JACOBY.

EXCAVAUNG MACHINE.

APPLICATION FILED SEPT. 25| H715.' SQQQ?. 4 lzen'odept. 5, 1916.

7 SHEETS-SHEET 7.

CHARLES B. KING, CHARLES S. J OHN SON, AND BENJAMIN JACOBY, OF MARION', OHIO, ASSIGNORS TO THE MARION STEAM SHOVEL COMPANY, OF MARION, OHIO, A COR-f PORATION OF OHIO.

` EXCAVATINGfMACHINE.

Application filed September 25, 1915.

To all whom it may concern.'

Be it known that we, CnanLnsB. KING, ("uannns S. Jon NsoN, and BnNJAM 1N JaconY, ,citizens of the United States, residing 'at Marion, in the county of Marion and State of Ohio, have invented certain new and useiful Improvements in Excarating-Machines,

of which the following is a. specification, reference being had therein tothe accompanying drawing.

This invention relates to excavating machinos and more particularly to an excavating machine of the steam shovel type utilizing an internal combustion engine as its source of power. It is well known that steam shovels commonly employ a plurality of individual engines for operating the several parts of the mechanism. There is an engine to operate the hoisting mechanism, another to operate the swinging mechanism and a third on the boom to operate the crowding mechanism. The character ofthe steam engine is such that these engines can be located at points reniote from tlieoperator andy readily controlled and be :anse of their flexibility they are well adapted fo-r this work. ing to the load and the engines can be readily reversed. lV ith a gas or internal combustion engine the crank shaft rotates continuously in one direction, that is, it is not reversible, it cannot be as readily startedI as a steam engine can. and under excess of load will choke down and stop, and it isv necessary to relieve it of `itsfload before it can be again started. Because'ot these characteristics lof the gas engine it cannot be utilized in the saine manner that a steam engine is utilized.

The object of the present invention is to provide an excavating machine in which a single gas engine will vbe utilizedto drive the various parts of the mechanism and the power will be so distributed and controlled as to enable these various parts to be operated and controlled in substantially the same manner in which they are operated and controlled by the individual steam engines.

To this end it is a further object of the invention to provide means for operating the crowding mechanism on the boom from a crowding shaft on the main platform. It is also an object of the invention to provide means for automatically relieving the en- The power can be regulated accordv Patented Sept. 5. 1.91 6.

Serial No. 52,546.

gine from ari/excessive load, thereby avoiding the choking down of the engine.-

It is -also an object of the invention to so construct and organize the machine as a whole that it will be very compacty in its arrangement; that the several parts thereof will be readily accessible; that it will be of' a strong, durable character with no parts liable to be broken or disarranged; and that it can be constructed at a lon7 cost.

In the accompanying drawings, Figure 1 is a side elevation of an excavating mechanism embodying our invention; Fig. 2 is a top, plan view of such a mechanism with the. 7 boom removed; Fig, 3 is an enlarged" plan of a portion of the handle operating gears, the handle being shown in section; Fig. 4 is a sectional plan view showing the driving connections from the engine and the re-. versing clutches; Fig. 5 is a detail side elevation of the clutch band operating and connecting devices; Fig. 6 is a section on the line :c :n of Fig. 5, looking in the direction of the arrows; Fig. 7 is a side elevation of the reversing gear and brake drum operating lever devices; Fig. 8 is a plan thereof shoW- 80 ing the operating devices. in neutral position; .F ig. 9 is a similar view showing the position of the device when oneof the brake bands is in engagement with its drum; Fig. 10 is a transverse, vertical section through the hoisting drunr and associated parts;

Fig. l1 is a plan view showing the control-` ling lnechanism for the crowding mechanism; Fig. 12 is a detail view showing in front elevation the brake band of Fig. 11; and Fig. 13 is a side View, partly in section, of the mechanism shown in Fig, l1.

In these drawings we havev illustrated the invention as applied to a power shovel of a well known type. The mechanism comprises a truck having a base l, traction Wheels 2 andsteering Wheels 3. Rotata-b1y mountf ed upon the truck is a platform 4 at the for' ward end of which is pivotally mounted a boom 5 carrying the excavating device, which, in the present instance, is in the form of a dipper 6 carried by a handle 7 extend.- ing transversely of the boom', between the two members thereof, and provided on I'its rear edge with av toothed rack 8 Which meshes with a pi 'on 9 on a shipper-shaft 1 0 journaled on theliioom. Mounted on the opposite ends of the shipper-shaft are gears eef 45 teine ero wu ml usuel ily nl..

titi

11 meshioof with pinions 1Q o arriecll. by n oountersh: 13 on whieh is ouiunteol,` preterably lgietween the pinione 1:2.. o bevel gear 1l mesh.- '1h n beitel pinion lrorrieil by one en. ot n. ehutt lll exteutliiigflength `wise. ot the liooin :intl jmirrmloll in suitoljile ben.riilg'r` l uheli :ire hero @shown no :termoli in brach lil. This Ineolninieln comprises n. ormrrliooj .ineolmnisn'i tor the (lipper and 0 serves to import longitudinal movement to the clipper handle i', whereby the {lipper is moved touuird or owny troni the Work. The clipper elo *n.tefl, to till the some, by ineens ot e cable l) Whieh exteilds about sheaves 15 20 on the enel oi the boom and posses lengthwise ol" .l boom. to n lwistino,r rlrllln mountr on n. shot't on the. i*)lzittorrn Li. lo. orrh nino: the dinner into proper ponition. Wi l relation. to the wo l tlult it anni" ontl to then cuuwejr tho clipper to whieh it o be lonnit-ll. the platform le rerolrerl :ihout its :u This is` :Loooni teil lo." lorovieillis the been l. ot the truolr with :1.- itecl ,goor or annuler roolr Q3 'with 'which loefihee o. pinion t mounted on :i ehortoluiiit to whieh is seein-ell n gear meshing `Witloi. n pinion itl' on the lower end ot n. oluitt 2B orrouggml vortioolly in the platform t enel. hitting ot ite upper enti u bevel gooi.' ylfhe umili tentures ot eenstrioztionD es heretofore ileiserilziorl, lo not rliilor looterieflly trol the. otitnrloril ehovels. timoh dit! Llereneee they be noteil nre ttor the porm pose of xnunlntiogg. the device Yto the present iiwrntion enit enter into ooopero tion with. o moellon to be lo; einotter rflesoribeffl.

liloonteil on the reni? portion ot the plut im torni, tluit 'it that portion oijipoe' the benin 5m is.: :lo in .mail oombuetion engi .e lll) which nifty be o :my suitable type nml in here shown zo; o tour cylinder engine oil. ai. eterni oral Constr!urtion.

ter tonite lill tor the. witter oooling oyetoon the oouileetmg pipes honing; been brol o. *n.52 The tool toni: not shown but unit' be toronto-xl. in. ony suitable locution. lh'eterobly, because. ot the` erowfl the. 1.1 oint ed oonriitioo ol: the "plettrnlnw it will be The ornnh ehnt't ot the engine centered@i vforwn'rtlly ti is journnlecl. in n. homing; 33 mounted. n the nlnttorni or moin. sup

porting treinta lfnterpoerl between the, beii1.in,g., lr unil the enel ott the ei' ine ie the iol 341. it. bevel `nii. .on lit rig idly seeureil. to the enel of: the onreine ehnt't 3Q; meshes with two opposecllserel pinions.

.36 :incl 37' loosely mounted on n theft il@ en tending; trenoversoly ot the plattform t noel mi `jonrnoled in. bearings 39. This elmiit tony be (in either side. ot the eri# meente termed the moin shutt or renfersingr shaft because not onlyr (loes it serre :1s the medium througl'i which the power is transmitted from the engine to :lll of the ports of the tneef'hnnisnl but it also is reversible und 70 serves :is the reversing shaft for eertuin parte ot the nieolmnisu'l, such as the `propelling); deviens, :is will be hereinafter described. To this end ineens are provided for clutching either of the bevel gears 36 or 3f( 75 to the shaft while its` eonlpanion geur is :1.1- lowed to run iille,lnnrl there is provided n suitable oontrolling,r device for this clutch ineehanienn whereby the one gear will be nutonmtieolly released before the other is 301 olutohefl, to the shaft. The oluteh meollonieni, zxslierein shown, omnprisestwo friotion drums et!) :incl 4]. mounted upon and rightly eeeurell to elongated hubs 43 torni-` ingn port of the respective gears $36 :incl 37. `3|; ltigirlly seem-oo to the shaft :uljneent'to the trietion (lrlnns el() and fll ure two supports @it nod fit, here shown in the form of wheels or slihlers. tlnrrirll by these supports :1re friction bends ll-G :nul :Jff which extend about 90 tho roepoetive friction (l1-Inns 40 :unl ll :unl ore eeeurell et their enfls to their respective nimporte. hilt-ins nre provided on euch support ttor tigri). )ning or loosening tho band aillent the triotion drum und, to this end, one or both ot the eucls oi the friction band are zidjuetebly eouneetefl with the support. In the present construction two studs or short @hotte ttt :1nd Alf), Fig. 5, are rotatably inonnterl in eneb. support und euch shaft is prm'hleclf on its inner end with n ernnk arm 5f.) beting o pin or trunnion 5l to which the ends et the t'rietion bond nre connected.

't shows the ornnlrerm 50 :md pin 51 in connection with the stud 4D. The nr- 105 rangement is the same on the stud 48, a1- though not shown. It is thought thntthe structure will be clear. The crank shaft, 48, is helcl normali),T against movement and, to this enel, provided with :i crank arm 51 110 lmringl' oonneoterl to its outer end one end of rorl of?, the other encl of which is slidzibly mounted in sin operturecl lug 53 secured to the support t4 or 45. onlnecl between the lug.; 5ft and n shoulder 54 on the rofl 52 is av 115 springt et suoli strength that it will norinolly hold the crunk erm 5l and the shaft llt: against movement in one direction, the rod being helcl against movement in the other direction by e. uut 5G. Means are pro` 120 vitlecl for monipnlnting the other crank arm enel shaft to tighten orloosen, as muy be' deeiretli the `t'riotion band. As here shown, this other oronlt' Shntt, 119, is also provided with :1. ornnlr erm 57 to the outer end of 125 which ie connected :i link 58, `the opposite end ot which is pivotnlly connected t0 two other links. one of which, the link 59, is pivotnlly connected to :i fixed part of the support, :is to one of the spokes thereof. The

second link,"60, whichfis' connected with the linkv'58, forms a part of a toggle and is pivotally connected with a'link 61 which arm of thetoggle, 61, and extending through y fori the other part of thetoggle and which isQpivo'tally mounted at 62 upon the hub of the support. Rigidly secured to'the inner a slot 63 in the hub of the support 44 is an 64, the inner end of which extends into an opening or slot 65- forined in a plunger orslide rod 66 which slidably mounted in Kamaxialopening 67 formed in one end of theshaft 38 and slidable therein. Gbviously,

the, eeiprocation ofv the plunger 66 will brealepor straighten the toggle 60-61, thus rocking the crank shaft 49 and tightening or j loosening the brake band. lVhen the toggle is,in its extended or straightened position the brake band will be in its tightene-d con.- dition and will be held very rigidly in that position because the several'aXes of the toggle are inalinenient, or preferably the.y central axis will have beeny moved slightly vbeyond gtlieyaxesof the ends of the toggle. There are,.of course, two of `these plungers 66, one mounted in each end fof the shaft, and the twjo plungers are preferably operated successively the one to straighten its toggle and tighten its clutch band and the other to break its toggle and release its `clutch band. Further, it is desirable that 4this 'operation ybe, accomplished from a remote point, such for example, as the forward end of the plat- `form, at which pointthe operator stands. To1this end the two plungers are connected one .to the other and:` an operative connec- '.-tion is established between the one plunger .andi an operating lever. These. connections Sinayibe established in various manners but that shown. in Figs. El.' 7, 8 and 9 is a very ellicient one. As vthere shown vcontrolling lever 69, which vis located at the forward end .gof'the platform 4, is connected atvits lower *fendiwith a rod 70, which, 'in' turn, is conpnected with an arin 71 mounted on one end Y-'of ya shaft 72 extending transversely of the 4#platform and having at its other end a sec-` f :ond arin 7 3 which is connected byr means of aclink 74 with an arm 75 secured to the i lower end of a vertical shaft 76 mounted in suitable bearings 78 iiearjthe end of thel refxrersing shaft- 38. kA'siniilar shaft 79- is mounted at the opposite'. end of the iinain reversing shaft 38. andthe shafts, 7 6 andare provided, respectively, with arms 8O @fand S1 which areconnected one with the ``other by a rod .82.3 `Each lof the vertical shafts 7.6 and .'79 is provided at itsvupper lgend with anarm farms, 83, havingf y f edtoreceive trunn ons', asshown 1;*2andin.-projeotingfl y v l66,y thereby establishing ireferably a'pair of eirends slots S' (lapt-j in ,the outer en respective plungers an operative connection between the control ling lever 69 and the two plungers.

The connections between the plungers and the controlling lever are such that the movement of the lever from its neutral position in one direction will actuate the selected plunger only and will allow the other plunger to reinain'idle, and further, this connecmove the same independently of its shaft.4

There is one of these springs arranged about the linb of each arm S3, as shown inore particularly in Figs. 7 and S, and the spring is secured at one end to the hub, as'shown at 90, and at the other end to a` pin 91 rigidly secured 'to a. fixed part adjacent to the hub of the arm.

On account .of the construction of the ykey-ways in the'arins83 and the shafts 7G and 79, there is in reality no connection between these parts in certain positions and the springs are counted on to impart the movement to the arms. .Vhen the arms are in their neutral positions, as shown in Fig.

8, the movement of the connecting rod S2 in the direction of the arrow will cause the key 88to be engaged with the side of the keyway in the. arm 83 on the shaft 7G, the arm yturning with the shaft76 and of course setting the friction. Aty the -sanie time lthe shaft 79 will rotate but no motion will be given the arm 83 on the shaftf79 as in this position the kev 8S in the shaft 71) has no Contact with its arin S3. 'l`lierefore5 the arin 83 on the shaft 79. will/remain sta` tionary, as the key does not move through an arc greater than the. length of tho keyway in. the arm. After the arm S3 on the shaft 76 has been moved to its in or clutchedposition audit is desired to release `the sainethe connecting rod 82 is moved in the oppositev `iirection7 but kas there is thenno Contact between the key SS and the :1i-m83 on the shaft 76in this direction, the spring must impart the motion to the arin 83 and throw out the clutch. ln case the armBvshould stickforsome reason. then after" the hey 8S has rotated through the fullfwidth of the 'key-way in the arin 83, it wouldl engage theside Vof Ithekey-way in theaijni S3 and Agive the arni astartgvthe spiii 'jA :throwing it outthe remainder of the w'ajv This sfeati'ire ofsyhaving the `spring having but halfl the travel that "would be necessary incase the arms were keyed solid to the shaft. lf the arm 83 were keyed solid to the shaft then it would be necessary to provide sufficient throw to allow one side to be completely thrown out before the other side was commencing to throw in, but with the present arrangement the two arms act independent of each other, that is, with the arms in neutral position no motion is imparted to the right hand arm while the left hand arm is `being thrown either in or out, or vice versa. This is on account of the long key-way in the arm 83, as the amount of travel necessary to throw the arm 83 on the shaft 79 to in position is no greater than the amount of travel of the shaft 76 before it strikes the opposite side of the hey-way in the arm S3. lith the arm 83 on the shaft 79 thrown to in position, the key S8 would engage the side of the keyway, as shown, then in throwing this arm out the spring would cause the arm to fol low the key until the arm S3 reached the Lout7 position, when the arm 83 would stop, but if the motion of the shaft 79 was contiuued in the same direction, which would be the case in setting the arm 83 on the shaft TG, the hey 88 in the shaft 79 would simply turn through the key-way until it reached the opposite side of the key-way, by which time the arm S3 on the shaft 70 would he in Lin position. After the spring has moved the arm to out position the travel of the plunger' will prevent any further movement thereof.

It will be apparent that the mechanism for driving and controlling the main or reversing shaft from the continuously rotating engine shaft is such thatthis shaft can be caused to rotate in either direction or to remain stationary and further that under an excessive load which would tend to choke down the engine the spring will yield and permit the friction drum to rotate relatively to the friction band and, consequently permit the engine shaft to rotate relatively to the driving shaft 38, thereby enabling the load either to be picked up gradually or to give the operator an opportunity to relieve the machine of its load, or a part thereof, without stopping the engine.

Extending transversely of the platform immediately in front of the main or reversing shaft 38fis a second transverse shaft 92 which is mounted in bearings 93 and is connected with and serves to operate the swing ing mechanism and the bull pinion 24. This shaft is connected with the shaft 38 by means of a gear 94 rigidly secured thereto and meshing with a gear 95 rigidly secured to the main shaft 3S. Consequently, the shaft 92 willbe controlled by the movement of the shaft 99. This shaft 92 is provided near its outer ends 'with gears 96 and 97 which mesh, respectively. with pinions 98 and 99 on short shafts 100 and 101 having at their inseam inner ends bevel pinions 102 and 1055 which mesh with the bevel gear 29 which is connected through the gears 27 and 26 with the pinion 2li, which latter is adapted to travel about the fixed annular rack or gear 23 and impart swinging movement to the platform and boom. The gears 90 and 9T are, of course, loosely mounted on the shaft 92 and are adapted to be individually connected thereto. To this end each gear has rigidly secured thereto and preferably mounted on the hub thereof a friction drum 104: about which extends a friction band 105 which is connected with a support 100 in substantially the same manner as described in connection with the clutches on the reversing shaft 3S. Further, the clutch bands are manipulated by mechanism substantially similar to that shown and described in connection with said reversing shaft. In the present instance, the controlling lever for the swinging mechanism is shown at 10T and is 4connected by a rod 10S to a short .transverse shaft 109 and by a. second rod 110 with a crank arm 111 which is connected with an operating mechanism for the brake bands similar to that described, it being noted that the operating mechanisms for the two clutch bands are connected one to the other by a connecting rod i12 similar to the rod 82 which connects the controlling devices for the clutches of the reversing shaft. Thus, it will be apparent that the swinging mechanism may be controlled to cause the boom to be swung in either direction independently of the direction of move nient of the mainshaft 38. a

Rigidly secured to the shaft 92 is a pinion 113 which meshes with a gear 114 rigidly secured to the shaft 22 also extending trans' versely to the platform and having loosely mounted thereon the hoisting drum 21 about which is wound the hoisting cable 19 for the excavating device or dipper (3. This hoisting drum is provided 4with a portion constituting a friction drum, as shown at 117, and a friction band 118 extends about the friction drum to connect the hoisting drum with and disconnect the sa me from the shaft. As under normal conditions of operation it is only necessary that the hoisting drum should be positively rotated in one direction it is provided with a single clutch device for connecting it with the shaft. lhen released it is turned in the other direction by the weight of the dipper as the latter descends, Suitable brake mechanism is usually provided to control this movement of the drum, butthis forms no part of the ,invention and is not here shown. The hoisting drum shaft 22 is' also utilized for actuating the propelling devices for the truck. 4To this end it is provided at one end with a gear 119 which is loosely mounted thereon and which meshes with a gear 120 on/a shaft 121, to the inner end of which-is secured a bevel pinion 122 meshing 'lol Liedes? with a bevel gear 123 secured to the upper 'end of a vertical shaft 124 extending through the platform and base of the truck, centrally of the annular rack v23, and having at its lower end a bevel pinion 125 meshing with a gear 126 on the propelling shaft 127 which is geared to the traction wheels in the usual manner.v The gear 119, which is loosely mounted on the hoisting drum shaft 22, is adapted to be connected thereto by means of clutch mechanism, and as `here shown the gear 119 is provided with a tapered clutch housing 128 having an internal friition surface adapted to be engaged by a movable clutch member 129 which is slidably mounted 'on but keyed to the shaft 22 and is provided with a groove'd collar to receive a yoke 130 of an actuating lever` This lever is slown at 131, Fig. 2, and is connected with tl e clutch member by means of a rod 132 `which is connected by. means of a bell crank glever 133 with a transverse rod 134 which is connected with the yoke 130. Thus, the propelling mechanism is controlled indepeiid- .ently Vof the hoisting mechanism, the hoist?l ing drum being preferably controlled by an overhead lever .135 which is connectedv through a vertical shaft 136 with clutch band peiling mechanism is clutched to the shaft 22 the rotation thereof can be reversed by reversing the rotation of the reversing shaft 38, as described above. The reversing of this shaft is accomplished by throwing the lever 69 back.

Power is transmitted through vthe hoisting drum .shaft 22 to the crowding mechanism and to tlils end the gear 114, which is keyed.

to the shaft 22, meshes with a pinion 137 p keyed to a shaft '13S exitenifling transversely of the ilattorm and having at its other end a gear 139 which meshes with -a gear 140 on the crowding shaft '141 which extends transversely of the platform near the base of the boom. Loosely mounted on this shaftare two bevel gears 142 and 142 meshing lwith a bevel pinion Mit-secured to the lower end of the shaft 16 which actuates the shipper' shaft on thel boom. The gears 142 and 142 are provided withclutch devices 144 and 1'45 by .means of which either of them may be secured to the shaft and actuated. The mechanism for controlliiif-j the gears 141 and digging operation of they .reversing-'devicestherefor. 1. The boom 5 is capable of adjustment and of slight movements relatively to the plat-- 142 on the crowding shaft 141 is substan-i tially the saine as that for controlling the gears 36. and 37 on the main or reversing shaft 38 and' need not be further described, The controlling lever for the crowding mech-` anism is shown at 146 and means are ,provided for locking the crowding mechanism against movement when this lever is inuits normal or intermediate position. ,To this 4end the shaft 16 is provided with a brake drinn 147 about which 'extends ra brake :band

148.. The ends of this brake band areycon-` `nected to the opposite arms of a bell'crank lever 149 which is mounted-on the upper end of a shaft 150 extending substantially parallel with the shaft 16 and provided at its lower end with a crank arm 151, which `is here shown as a double arm. Connected with the arm 151 is one arm 152 of a toggle, the other` arm 153 of which is rigidly. secured to a transverse shaft 154 on which the controlling lever 146 is mounted. The arrange- ,-,i l

ment of the toggle with relation tor the lever is such that when the latter' is lin its normal -position the toggle will be straight andthe brake band 148 drawn snugly about `the brake drum 147, thus locking the shaft' 16 against lrotation. vlli/hen the lever is moved in either direction the toggle is broken and the brake band released. The rod 154 je'X# `tends transversely Ato the platform and is provided at that end opposite the lever 146 with an arm 155 which is connected bya link 156 with an arm 157 which is rigidly secured to a vertical shaft 15S forming a part of the clutch controlling mechanisnifor the crowding shaft. This vertical shaft is connected by means of an arm 1519, rod 160 and arm 161 with a Second vei'tical'sl'ia-ft 162iofA said clutch controlling me `:lianism, which, as has been stated, 1s in other respects similar to the clutch controlling mechanism forthe.

clutches on the shaft 3S. n

The term adjusting device as used in connection with our combined reversing devices aiid locking means for the crowding mechanism is defined as such an arrange-r l v will cause the crowding mechanism to be locked and the reversing devices to assume such a position` as to disconnect thev source .ment or combination of mechanism which of ypower from `the crowding mechanism.

and vice versa, the parts coperating as a unitary arrangement as distinguished.from separate devices for operating the. locking means for thecrowding mechanism and the form and :it is desirable that ymeans should' be provided for so connecting then-shaft 16 i with the crowding shaft on the phitfoiimla-nd.

with the 'shipi'ier-shaft on the; boom as; to prevent binding or `breakage due towsuch movement of the boom. To this end. the

connected to said motor and when so connected the direction of movement thereof can be reversed 3,..In an excavating machine, a plurality ofV mechanisms for ,bperatingthe various parts thereof, a"A motor provided with a shaft rotatablein 'onef'directiom a transmission system interposed between said mechanisms and said'motor, each ofsaid mechanisms being providedv with means for connecting and ...disconnecting thel same to said transj mission-system, and means common to all of y. said mechanisms for connecting and discon- 'adapted to rotate ne'cting the motor therefrom and for reversing the direction of motion. Y

4..In 'an excavating machine, a truck, a platform mounted onv said'truck, a boom, an excavating'member mounted on said boom,

y crowding aand hoisting Adevices for said eX- an engine having a shaftl cavating member,

continuously 1n one dlrecntiona reversing shaft operatively connected with said engine shaft, operative connections-.between said reversing shaft and said hoisting and crowding mechanisms, yieldable clutch mechanisms mounted on said rerversing shaft to control the direction of rotation thereof and to prevent said engine from being choked down by anoverload.

l 5. In an' excavating machine, a truck, a platform mounted. on said truck, a boom, an excavating member'mounted on said boom, crowdingand hoisting devices for said eX- cavating member, an engine having a shaft adaptedto rotate-continuously in one direc'- tion, a reversing shaft operatively connected with said engine shaft, swinging mechanism fnr said boom, propelhng mechanism for said truck, operative connections between said crowding, hoisting, swinging and vpropeiling mechanism and said reversing shaft, means for reversing the direction-of rotation of said reversing shaft, and means for controlling said mechanisms independently of said reversing means.

6. In an excavating machine, a motor, a reversing shaft operatively connected'to said motor, means for reversing `the direction 'of' rotation of said shaft, swinging mechanism, an operative connection between said swinging mechanism and said means for controlling the direction of movereversing shaft,

ment of.said` swinging mechanism, hoistving mechanism,

through a portion of said swinging mechanism with said reversing shaft, and a drum mounted thereon and means for connecting and disconnecting said drum'with reference to said hoisting shaft, propelling mechanism A. W. GRAoELir,

D. L, CULP.

D said hoisting mechanism n' comprislng a shaft operatively connected, 

